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Патент USA US3064168

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Nov. 13, 1962
D. c. BUCK
3,064,158
MAGNETRON CAVITY RESONATOR ASSEMBLY
Filed May 4, 1961
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INVENTOR.
DANIEL C. BUCK
BY
1,2.ATTORNEY
/6L~
Nov. 13, 1962
D. c. BUCK
3,064,158
MAGNETRON CAVITY RESONATOR ASSEMBLY
Filed May 4, 196].
v
2 Sheets-Sheet 2
HQ. 3
-
1121M“.
ATTORNEY
ilnited States Patent 9”
cs
1
3,064,158
Daniel C. Buck, Horseheads, N.Y., assignor, by mesne
MAGNETRON QAVETY RESONATGR ASSEMBLY
assignments, to the United States of America as rep
resented by the Secretary of the Navy
Filed May 4, 1961, Ser. No. 167,372
5 Claims. (Q1. 315-3955)
This invention relates to electronic discharge tubes of
the magnetron type adapted to generate ultra-high fre
quency oscillations and in particular is concerned with
3,664,158
'Patented Now 13, 1962.
2
a volume of the resonator to
tuning rates.
provide for large or small
’
The above and other objects and features of the inven
tion will be fully set forth in the following detailed de
scription, taken in conjunction with the accompanying
drawings, in which:
‘
FIG. 1 is a perspective of a magnetron and an external
cavity resonator assembly of the present invention with
portions of the assembly removed to show details.
FIG. 2 is a sectional view on the line 2—2 of FIG. 1
looking in the direction of the arrows.
tuning of a magnetron to convert it from a ?xed-tuned
FIGS. 3 and 4 are longitudinal sections through mag
oscillator to a tunable device.
netron and external cavity resonator assemblies showing
The need for tuning a magnetron oscillator may arise
of details of the resonator of FIG. 1.
in a situation where the oscillating system of the magne 15 modi?cations
Referring to FIG. 1, one type of cavity resonator of the
tron is predesigned to operate at a de?nite frequency, and
invention is shown at lO‘and assembled with a magnetron
it is therefore useful to be able to adjust the operating fre
indicated at 11 which_i—s_of the type having an anode block
quency or in the case of an oscillator which is off fre
12 formed wTzh a plurality of generally cylindrical shaped
quency, it is useful if it can be brought to operate within
the frequency band by effecting a small change in the 20 cavities 13. The anode block 12 is cylindrical and is en
closed within a housing having a cylindrical side wall 14
resonating properties of the oscillator.
and similar end walls 15—'15. At 16 is shown the central
The present invention relates to the type of tuning device
which is mounted exteriorly of one or more of the reso
cylindrical reaction space of the magnetron which com
nant segments of a multi-cavity magnetron anode and
municates with the cavities 13 through coupling channels
Tuning by use of a diaphragm has been subject to some
de?ciencies in the past, particularly when a diaphragm is
used to adjust the capacitance reactance of magnetrons of
12 will preferably be constructed of a conductive or di
struction of cavity resonator which is formed with or at
tached to the exterior of a multi-cavity magnetron struc
has a closed outer end 22 and sidewalls 23-23 as in FIG.
utilizes a diaphragm arranged for suitable adjustment, for 25 or slots 17 and has disposed centrally thereof a cathode
v18 which is in the form ofa cylindrical rod and supported
example, by manual, electro-mechanical, hydraulic or
in position by suitable means, as shown, for example, by
electronic means to vary the capacitance reactance of the
patent No. 2,466,765 to P. L. Hartman. The anode block
magnetron.
electric material in order that'the surfaces of the cavities
13 will be sufliciently conductive to function as re?ectors
of the electro-magnetic waves of the frequencies which
large physical dimensions, since it has been customary or
are generated by the magnetron.
necessary to use a large diaphragm for accommodating it
The resonator 10 is in the form of a rectangular hous
to the iris structure of the magnetron and the large dia
phragm has been subject to vibration and thermal distor 35 ing which has substantially greater length than width or
height and is secured to the cylindrical wall 14 of the
tions. Additionally, the large dimensioned magnetrons
magnetron in sealed relation therewith. As shown in
have required a large tuning cavity to provide effective
FIG. 1, the upper and lower walls 20 and 21, respectively,
tuning and this has presented a problem in cooling for
of the resonator 10 are in the form of extensions of the
maintaining the tuning structure at proper temperature.
Speci?cally, the invention is directed to a design or con
annular sidewall 14 of the magnetron and the resonator
2. The inner end wall of the resonator 10 is formed by
a portion of the anode '12 and is in comniiinication with a
vibrations or distortions. The invention is predicated on
selected cavity identi?ed at 13’ through a resonant aper
the idea of a cavity resonator of rectangular shape having 45 ture 24 formed in the end wall portion of anode 12 pro
a length of one-half the wave length at the frequency of
viding an arrangement for communication between the
operation of the magnetron with which it is used and is
resonator l0 and the reaction space 16 of the magnetron
substantially of less width and height. Within the rec
11. A grim-p of rectangular ?ns or plates 25 have their
tangular cavity a plurality of ?ns or plates are arranged
Emer edges ?xed to upper wall 20 of the resonator and
to effect a periodic loading of the cavity resonator. The 50 extend therefrom in parallel relation with end wall 22
?ns of the cavity resonator extend from one wall and have
toward the bottom wall 21 providing a space 30 therewith
ture and is not subject to improper operation by internal
side and end edges which are disposed in spaced relation
with the other walls and the resonator communicates with
a selected one of the magnetron cavities through an open
ing in the magnetron anode.
This general design of resonator permits it to be con
structed of small dimensions and yet be used with large
magnetrons. Speci?cally, a rectangular housing 3" in
length by approximately 1%" in width by 2A" in height
has been used effectively on large magnetrons whereas a
cylindrical type of resonator used with large magnetrons is
which is de?ned by the plane of the lower edges of the
?ns 25. The ?ns, which extend transversely of the reso
nator, terminate short of the sidewalls 23—-23 and provide
other spaces 31 and 32 with the sidewalls and which com
municate with the space 30, the spaces 31 and 32 being
de?ned by the planes of the respective side edges of the
?ns 25.
The principal electric and magnetic ?elds of the reso
nator 10 of the assembly are indicated respectively by the
arrows at E and H. The capacitance between the edges
of adjacent ?ns may ‘be adjusted by the provision of a
of approximately 7" in diameter.
One object of the present invention is to provide a
diaphragm 35, disposed as shown in FIG. 1, adjacent the
cavity resonator structure for a magnetron whereby the
lower wall 21, and having its peripheral edges in tight
frequencies generated by the magnetron may be varied or 65 ?tting but movable relation with the side walls and ar
controlled from a point externally of the magnetron.
ranged to be adjusted by any suitable means or the lower
Another object of the invention is to provide a rectangu
wall 21 could be formed of ?exible diaphragm material.
lar cavity resonator structure which is of sectional or
For adjustment of the diaphragm, a shaft 36 is arranged to
compartrnented design providing for its periodic electrical
adjust the volume of the cavity resonator and as shown
loading of energy from the magnetron.
70 is screw-threadedly mounted in the lower wall 21 for
Still another object of the invention is to provide a cavity
manipulation by its knurled end 37.
resonator structure utilizing a diaphragm for adjusting the
'In FIGS. 3 and 4, the resonators are modi?ed over the
3,064,158
3
.
construction shown and described in connection with FIG.
1. In FIG. 3, the ?ns are identi?ed at 40' and extend from
the portion of the anode 12 which forms the inner end
wall of the resonator in parallel relation with the upper
and lower walls 20 and 21 toward the end wall 22 of the’
resonator in spaced relation therewith and the side edges
of the ?ns will be understood, although not shown, to
be disposed in spaced relation with the side walls 23-43
of the resonator. The diaphragm in the modi?cation is
mounted in a manner to be moved toward or away from
the ?ns by means of the adjusting shaft 36.
In FIG. 4, the ?ns are divided in sets, the ?ns of one
set being indicated at 50 while the ?ns of the other set
4
opposed walls and diaphragm means in the cavity reso
nator adjacent said other wall of said second opposed pair
of walls for varying the volume of the resonator.
3. A tunable magnetron oscillator of the type compris
ing an annular anode ring having a group of circumferen
tially spaced oscillator cavities disposed inwardly of its
outer peripheral wall, a slot communicating through the
peripheral wall with one of said cavities, a cavity resonator
formed of pairs of opposed walls providing a boxlike
construction integral with the anode ring and extending
outwardly thereof, one Wall of said resonator being formed
of a portion of the anode ting bounding said slot, a plu
rality of rectangular ?ns arranged in spaced parallel rela
tion with each other and with said inner wall of the
said ?ns having one edge secured to one side
the top wall 20 and extend toward the bottom wall 21 while 15 resonator,
wall of the resonator and its other edges spaced from the
the ?ns 51 of the other set are secured to a diaphragm
other side walls of the resonator and diaphragm means
52 which is disposed adjacent the bottom wall 21. Ad
in the cavity resonator adjacent the side wall opposite said
justment is made by means of the adjusting shaft 36 in the
are indicated at 51, one set of ?ns as 50 are secured to
manner of FIGS. 1 and 2.
_While there has been described what is at present con
sidered to be the preferred embodiments of this invention,
it will be obvious that various changes may be made
therein without departing from the scope of the invention.
I claim:
1. A tunable magnetron oscillator of the type compris
ing an annular anode ring having a group of circumferen
tially spaced oscillator cavities disposed inwardly of its
outer peripheral wall, a slot communicating through the
peripheral wall with one of said cavities, a cavity reso
nator formed of pairs of opposed walls providing a boxlike'
construction integral with the‘ anode ring and extending
outwardly thereof, one wall of said resonator being formed
of a portion of the anode ring bounding said slot, a
plurality of rectangular ?ns arranged in spaced parallel
relation with each other and with one pair of opposed
walls, each ?n having a ?rst and second pair of opposed
edges, said ?ns having one edge of the ?rst pair of edges
secured to one wall of a second pair of opposed walls and
the other edge of said ?rst pair of edges providing a space
with the other wall of said second pair of opposed walls
and said ?ns also having one edge of the second pair of
one side wall for varying the volume of the resonator.
4. A tunable magnetron oscillator of the type com
prising an annular anode ring having a group of circuiri-l
ferentially spaced oscillator cavities disposed inwardly of
its outer peripheral wall, a slot communicating through
the peripheral wall with one of said cavities, a cavity
resonator formed of pairs of opposed walls providing a
boxlike construction integral with the anode ring and
extending outwardly thereof, one wall of said resonator
being formed of a portion of the anode ring bounding said
slot, a plurality of rectangular ?ns arranged in spaced
parallel relation with each other and with said inner wall
of the resonator, said ?ns having one edge secured to one
side wall of the resonator and its other edges spaced from
the other side walls of the resonator, diaphragm means in
the cavity resonator adjacent the opposite side wall from
said one side wall and means carried by said opposite side
wall for adjusting the diaphragm to vary the volume of the
resonator.
5. A tunable magnetron oscillator of the type com
prising an annular anode ring having a group of circum
ferentially spaced oscillator cavities disposed inwardly of
its outer peripheral wall, a slot communicating through
the peripheral wall with one of said cavities, a cavity
edges providing a space with one wall of a third pair of
resonator formed of pairs of opposed walls providing a
opposed walls and the other edge providing a space with
boxlike construction integral with the anode ring and
the other wall of the third pair of opposed walls and 45 extending outwardly thereof, one wall of said resonator
means in the cavity resonator adjacent said other wall
being formed of a portion of the anode ring bounding
of said second pair of opposed walls for varying the
said slot, a plurality of rectangular ?ns arranged in spaced
volume of the resonator.
parallel relation with each other and with one pair of
2. A tunable magnetron oscillator of the type compris
opposed side Walls of the resonator, said ?ns having one ,
ing an annular anode ring having a group of circumferen
tially spaced oscillator cavities disposed inwardly of its '" edge secured to said inner wall of the resonator and its
other edges spaced from the other end wall and the other 1
outer peripheral wall, a slot communicating through the
pair of opposed side walls of the resonator and diaphragm '
peripheral wall with one of said cavities, a cavity reso
means in the cavity resonator adjacent said other end wall
nator formed of pairs of opposed walls providing a box
like construction integral with the anode ring and extend
for varying the volume of the resonator.
ing outwardly thereof, one wall of said resonator being
formed of a portion of the anode ring bounding said slot, a
References Cited in the ?le of this patent
plurality of rectangular-?ns arranged in spaced parallel
UNITED STATES PATENTS
relation with each other and with the walls of one pair
of opposed walls, said ?ns having one edge secured to
72,532,545
Everhart ______________ __ Dec. 5, 1950
one wall of a second pair of opposed walls and its other
edges spaced from the other wall of said second pair of
opposed walls and from both the walls of a third pair of
2,589,903
2,624,864
Vitter _______________ __ Mar. 18, 1952
Herlin et a1. ____________ __ I an. 6, 1953
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